Bieber needs his bed rest! Justin Bieber kicked back at a London hospital following a scary fainting incident at a Thursday, March 7 concert. "Getting better," the "Boyfriend" singer, 19, tweeted. "Thanks for everyone pulling me thru tonight. best fans in the world. figuring out what happened. thanks for the love."

The pop superstar also shared an Instagram snapshot -- in which he reclines in a hospital bed, shirtless, smiling serenely for the camera. "Gettin better listening to Janice Joplin," he wrote in a nod to the late 60s soul/rock singer Janis Joplin.

Despite the scary fainting spell, Bieber continued with the performance after checking in with doctors backstage. "Justin fainted onstage tonight during his concert in London when he fell short of breath," his rep told Us. "He left the stage for 20 minutes, then came back and finished the show. He is now on his way to a doctor to get checked out and see what is wrong."

His manager Scooter Braun also explained to the crowd mid-concert what happened. "Justin got very light of breath. The whole show he's been complaining, and he's backstage with the EMTs and the doctor," Braun announced. "They're telling him that they want him to go see somebody and see what's going on with his lungs."